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[report整理] SENEWS-2011-04-25

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[Homework]【整理】SENEWS-2011-04-25

This the voa special english technology report
Solar water heaters are used around the world and are not very difficult to build. The system we are going to describe is based on the design developped some years ago in Afcane Stan. Since then, it has been built and used in many countries. It can heat seventy liters of water to sixty degrees Celsius. It can do this between sunrise and noon on a clear day with an average air temperature of 32 degrees Celsius. There are two parts of the solar water heater. One part is made of a sheet of metal painted black. Black services become hotter in the sun than services painted in the other color. This black metal plate is called a collector. The collector is placed in content with the water. Their are several kinds of metal sheets that can be used for collector. ? metal will work very well. ? sheets are often used as roofs on housing. Once the water is heated, it is kept hot with insulation material. This allows the water to stay warm for a long time. The seconds part of the solar water heater holds the water for the system. This storage tank can be a container that holds about one hundred liters. Two rubber pipes are attached to the water storage tank. One pipe lets water throw into the system, the other lets water throw out. When the water heater is working correctly, water will flow from the storage tank to the collector and back again. You can use the hot water at the top of the tank for washing and cleaning. You can change the flow of water so that the temperature is hot or warm as designed. This solar water heater is easy to build and uprate. It will last about two years before the rubber pipes need to be replaced. There were also something else you will need to make the solar water heater work, the sun. As you might imagine the heater will heat water only on sunny days.
You can get more information about solar water heaters and other project from interprise works viter. This group works internationally to fight ?. The website is interprise [email=works@com]works@com[/email] . choose the link for news and resources then click on publications. And that's the voa special english technology report.


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